Dental plugger.



(No Model.)

H. cAsE & a. n. SHAW.

DENTAL PLUGGER.

(Applicatinn filed Sept. 2, 1898.)

Patented luly ll, I899.

2 Shuts-Sheet l.

UNITED STATES PATENT OFFICE.

HENRY CASE AND EDMUND D. SHAV, OF GLOVERSVILLE, NElV YORK.

DENTAL PLUGGER.

SPECIFICATION forming part of. Letters Patent No. 628,524, dated July 11, 1899.

Application filed September 2,1898. Serial No. 690,070. (No model.)

To all whom'it may concern:

Be it known that we, HENRY CAsE and En- MUND D. SHAW, citizens of theUnited States, residing at Gloversville, in .the county of Fulton andState of New York, have invented a certain new and useful Improvement inDentalPluggers, of which the following is a full, clear, and exactdescription.

This invention relates to those dental tools which may be described asmechanicallyoperated mallets and which are sometimes designatedpluggers.

Our invention comprises a mechanicallyoperated plugger the movement ofwhich may be effected by hand or by power. The tool is arranged in asocket, which maybe adjusted so as to bring said tool in alinement withthe body of the instrument and at right angles thereto and at pointsbetween these two extremes. Between the tool and the hammer areinterposed a tool-locking block and a plunger cooperating therewith, thesaid plunger transmitting the blow of the hammer to the tool throughsaid block. The hammer has a reciprocating motion, and its stroke isgiven by the relaxation of a spring, and the move ment of said hammer iseffected by a manually-actuated trip-piece or by a cam which ispower-driven. By the use of the term mechanically operated we mean toinclude not only a spring, but also any usual power mediums asdistinguished from manual organisms. These features and other details ofconstruction, as hereinafter more particularly set forth and claimed,constitute our invention.

In the accompanying drawings, illustrating our invention, in the severalfigures of which like parts are similarly designated, Figure 1 is a sideelevation with the casing partly in section. Fig. 2 is a top plan Viewwith the casing in section. Fig. 3 is a plan view from the other sidewith the casing in section. Fig. 4 is a view similar to Fig. 1, butlooking at the oppositeside. Fig. 5 is an elevation. Fig. 6 shows insection, elevation, and perspective various parts of our plugger. Fig. 7is a perspective View of the plunger. Fig. 8 is a perspective View ofthe tool socket and tool. Fig. 9 is a perspective view of a trip-piecefor manually operating the plugger. a perspective View of alocking-lever.

Fig. 10 is Fig.

the said plunger toward the tool-socket.

I of the tool and toolsocket.

11 is a perspective View of the tool-locking block. Fig. 12 is aperspective view of the notches b for a purpose presently appearing.

c is a tube in which the socket b is secured, as by a pivot-screw c, insuch manner that more or less friction may be applied to the ears I) bin order to secure the said, toolsocket firmly in position. In a slot inthis tube 0 is pivoted a locking-lever cl, having a hook end or beard d,which cooperates with the notches b in order to hold the tool-socket inany given angular position with relation to the body of the instrument.The end (P of this lever is made as a cam, and with this cam cooperatesa sliding sleeve e in order to disengage the hook d from the notched earb and said sleeve engages the body of the lever to hold said lever inengagement with the said notched ear.

Within the tube 0 is arranged a plungerf, whichis held within the tubeby means of a screw-pin e, threaded into the sleeve e and projectinginto a slot f in said plunger. This slot is continued as a groove on oneside (see Fig. 7) to receive the lever 01. The plunger has a head f fromone side of which projects an ear f and between the head of this plungerand the shoulder ftin the sleeve is arranged a spring f which normallyprojects Between the heel a of the tool-shank and the ear f of theplunger is interposed a block g, which is mounted upon the pivot pin orscrew '0. One edge of this block is recessed at g to receive the heel aof the tool-shank, and the opposite edge is provided with a series ofnotches g to cooperate with the ear f of the plunger in order to effectvarious adjustments Norn1ally that is to say, when the tool is inalinement with the plunger-the notch-body g is interposed between theear f and the heel a of the toolshank, so as to transmit the motion ofthe plunger to the said tool. Inasmuch as the said heel a always engagesthe block, said block mustturn with the tool-socket, and hence the othernotch-bodiesg of said block are broughtinto position to be engaged bythe plunger-ear f and when so respectively engaged by the said ear f'each of said notchbodies serves a similar purpose to notch-body g intransmitting the blow of the plunger.

The tube 0 may be secured in the body h by a screw h, and its inner endreceives the point 7; of the hammer, said point being in alinement withthe inner end of the plunger and imparting the blow of the hammer tosaid plunger, which blow is transmitted to the tool through themechanism already described.

The hammer comprises not only the point '6, but a peculiarly-constructedblock .7 the essential features of whichare a recess j and aspring-tappet j having its free end projecting into the bottom of saidrecess, and this recess receives the arm of a trip-piece, Fig. 9, whichis pivoted to the casing h and is provided with a finger-piece 70 formanual operation. This trip-piece is lifted by a spring Z, secured tothe casing h out of normal contact with the spring-tappet 7' The block jis guided in its longitudinal movement by a screw or other device m,projecting into the upper end of the recess 3'.

Back of the hammer is arranged a spring 42, which normally projects thesaid hammer forward, and this springis held in place by a nut 0, whichis adjustable in the plug 19. (See Fig. 6.) The nut is held fromrotation by a pin 0, which engages a slot 0 in the casing, as clearlyshown in Fig. 13.

The plugp is arranged in the rear end of.

the casing h, and it is provided with a groove 19, which is inclosedwithin the said casing, and this groove is engaged by a lug q of aspring g, which is fastened to the casing, the said springhaving aprojecting portion g which engages with a deep milled portion 19 of theplug 19 in such manner that the said plug may be' rotated by its saidmilled portion p to adjust the screw 0 in order to put more or lesstension on the spring in order to increase or diminish the force of theblow of the hammer.

The devices q g g constitute the rear catch.

It will be seen that the trip-piece, Fig. 9, when depressed will engagethe tappet 9' as in Fig. 1, and force the block j backward against thetension of the spring at and that when in the arc of its movement thearm 70 disengages itself from the said tappet 3' the spring or willforcibly propel the block j and impart a blow to the plunger. Thus thein strument may be used under manual control; but we prefer to providealso for the operation of the instrument by power, and for this purposewe use a rotary shaft 1", having any usual means, as r, for connectionwith a source of power and supplied with a gearwheel 7- which mesheswith a gear-wheel s, the lastbeing mounted upon ascrew-stud .9, havingits hearings in the casing h. In order to receive this shaft 1" and itsgear 7- the rear end of the hammer is made hollow, and in order toreceive the gear 3 one side of the said hammer is slabbed off, as at andthe opposite side is left open, as at for a distance equal to the travelof the hammer. The gear 8 is provided with a cam s on its hub, whichcooperates with a projection s on the hammer, so that at each revolutionof the said gear-wheel s the hammer is moved back against the tension ofthe spring 02. and released to impart a blow.

t is a cap which. may be screwed onto the plugp to cover in the shaft 0"when the instrument is to be used as a hand-tool only.

it is a slide to cover an opening in the casing h, through which accessmay be had to the gearing for inspection and lubrication.

VVe'do not limit our invention to the form of tool or tool-socketdescribed or to other more details of construction, which are obviouslyvariable within the principle of our invention.

What we claim is 1. A dental plugger, having a tool-socket adjustablethereon to vary the angle of inclination of the tool with relation tothe body of the plugger, blow-imparting mechanism, and a notched blockmounted in and carried by the tool-socket and interposed between thetool and the blow-imparting mechanism, to transmit to the tool the forceof the blow at whatever angle the tool-socket and tool may be held,substantially as described.

2. In a dental plugger, a tool-shank-,asocket therefor means to adjustsaid socket at various angles to the body of the plugger, means to holdit in such adjusted position, a hammer mechanism, and a notched blockengaged by the tool-shank, pivoted concentrically with the tool-socketand movable therewith, and adapted to cooperate with the tool and thehammer through its notches to transmit the blow of the hammer to thetool in whatever position the tool and its socket may be given,substantially as described.

3. In a dental plugger,a to0l-shank,a socket therefor adjustableangularly with relation to the body of the plugger, a notched blockpivoted concentrically with the said socket, engaged by thetool-shankand movable therewith and with the socket, a spring-actuatedplunger in normal engagement with said notched block, and a hammer whoseblows are transmitted to the tool-shank through said plunger and block,substantially as described.

4:. In a dental plugger, a tool-shank, an adj ustable tool-socket, alatch to hold the socket in adjusted position, arranged parallel withthe plugger, a sleeve encircling the said latch to open and close it, aplunger, and a plungerblock interposed between the plunger and the tool,engaged by the tool-shank and turning with the socket, and a pin fast'insaid sleeve and passing through the plunger, substantially as described.

5. A dental plugger, having a sliding hammer, a spring from which itderives its force, and a hand-operated device for said hammer,comprising a spring-retracted trip-piece With an arm workingin a recessin the hammer, and a spring-tappet pivoted in the hammer and with whichthe said arm of the trip-piece is in slip connection, substantially asdescribed.

6. A dental plugger, comprising a hammer, a spring therefor, anactuating mechanism comprising a rotary shaft, a gear-wheel on saidshaft, a gear-Wheel as s, engaged by the gear-Wheel on the shaft, a camcarried by said gear-wheel s, and a projection on the said hammer in thepath of movement of the said cam, substantially as described.

7. A dental plugger, comprising a hammer, a spring therefor, a casing inwhich the hammer and a spring are inclosed and having a longitudinalslot 0 a plug for closing the end of the said casing, a spring-adjustingnut arranged in said plug and adjustable by rotation of said plug, andhaving apin 0 engaging said slot, and means to secure the plug rotatablyin said casing, substantially as described.

8. A dental plugger, having a hammer, a spring therefor, a casing inwhich they are inclosed, a plug for closing the end of said casinghaving a groove 19' and a milled portion 19 an adj usting-nut in saidplug for Varyin g the tension of the spring, and a springcatch having alug q and projection g for engaging respectively the groove and themilled portion of the plug to hold the said plug in the casing andpermit the adjustment of the nut, substantially as described.

9. A'dental plugger, comprising in a single casing a spring-impelledhammer, means for operating the said hammer by hand, and independentmeans for operating the same by power, substantially as described.

10. A dental plugger, comprising in asingle casing a power-hammer and ahand actuating device therefor, and also apower actuating devicetherefor, thesaid actuating devices being independent of one another,substantially as described.

11. A dental plugger, comprising in a single casing a power-hammer, ahand actuating device therefor comprising a trip-lever in engagementwith the hammer, and a power ac-

